Justin Timberlake, Jessica Biel and a pregnant Hilary Duff step out to support brain cancer awareness and medical research; Jon Hamm, Jenna Fischer, Nicole Richie and Eli Roth go to Spare Room to party for Mindy Kaling's new book; a very Twi-tastic premiere after party for Breaking Dawn takes a turn for the 90s with a mini Can't Hardly Wait reunion—L.A. was buzzing with events here and there on Monday, get the details in this edition of Last Night's Parties.

[Jon Hamm, Jennifer Westfeldt, Mindy Kaling via]

-

-

The Guest List

More

Seth Green• Justin Timberlake• Cindi Leive• Jessica Biel• Nicole Richie• Nick Cannon• Hilary Duff• BJ Novak• Taylor Lautner• Kellan Lutz• Eli Roth• Elisabetta Canalis• Stacy Keibler• Grauman's Chinese Theatre• Peter Facinelli• Rich Sommer• Dane Cook• Jon Hamm• Gilles Marini• Nicole Scherzinger• Cheryl Burke• Mike Comrie• Jennifer Westfeldt• Kaley Cuoco• Booboo Stewart• aziz ansari• Mindy Kaling• Ellie Kemper• Jenna Fischer• George Kotsiopoulos• Clare Grant• Magda Berliner• Jimmy Kimmel• Michael Chiklis• Nick Kroll• Busy Philipps• Elizabeth Reaser• Kym Johnson• Anna Faris• Jackson Rathbone• Bill Condon• Mehcad Brooks• Jesse Spencer• Moran Atias• The Launch Of The Beauty Book For Brain Cancer - Inside• Cody Longo• Pantera• Robin Thickew• Glamour's Cindi Leive Toasts Mindy Kaling And Her Book "Is Everyone Hanging Out Without Me? (And Other Concerns)"• Lennon Parham• "The Twilight Saga: Breaking Dawn Part 1" Los Angeles Premiere - After Party• Rob Friedman• Stephenie Meyer• Can't Hardly Wait